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[Problem Solving]

试题详情

题目:

Machines X and Y run at different constant rates, and machine X can complete a certain job in 9 hours. Machine X worked on the job alone for the first 3 hours and the two machines, working together, then completed the job in 4 more hours. How many hours would it have taken machine Y, working alone, to complete the entire job?

选项:

A、18
B、
C、
D、
E、

答案:

A

提问:

请问May老师,这题该用什么知识点去解?

解答:

点赞1
阅读1422
解答: 徐小梅

提问:

请问May老师,这题该用什么知识点去解?

解答:

点赞1
阅读1423
解答: 徐小梅老师

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